Cap for renewing the worn ends of engine valve-stems.



J. A.* M0HARDY GAP POR- RBNEWING "rHB WORN ENDS o? ENG-INE VALVE sTAEMs.

APXVLIOATION FILED UGZO, 1908.

Pmmled Nov. 22, 1910.

ATTORNEY Unrrnn sfrarns rafrnnfr ernten.

JAMES A. MGHARDY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE-HALF TOEDWARD M. JOHNSON, OF PROVIDENCE, RHODE ISLAND. i

CAP FOR RENEWING THE WORN ENDS OF ENGINE VALVE-STEMS.

Specification of Letters Yatvent.

Patented; Nov. 22, 193.02.'

Application filed August 20, 1909. Serial No. 513,796.

To all whom 'it maal concern:

Be it known thatI l, JAMES A. Mol-Ianni,

a citizen of the United States, resid-ing at the. city ot Providence. inthe county ot Providence and State ot' Rhode Island,.have

invented certain new and useful Improvements in Caps tor Renewing thelVorn Ends of Engine Valve-Stems, of which the tollowing is aspecification, reference being had 1o therein to the accompanyingdrawing.

Thisinvcntion relates to caps for renewing the worn ends or tips ofengine valve stems and the like, the object being to provide anextremely simple, effective and inexpensive device adapted to bereadily'attached to any l valve stem, or similar device after havingbeen worn, to restore the same to its original length and consequentlyto its original usefulness.

nother object of this invention is to so construct these caps or tipsthat they may be employed on either the valve stem or the valve liftmember, or both, if desired, when the same are new, so that either orboth may be readily replaced, thereby quickly renewing the ends of eachwhen worn and restoring the same to exactly their original length. Meansare also provided in thse caps whereby they may be'irmly secured to theends of the members over which they tit.

In the majority of explosive engines the ends of the valve stems come indirect contact -vvith the members which lift' them, and although bothare hardenedthe `continual action soon wears these ends, thus causingthe valveto be operated out. of time and so reduce the etliciency of theengine. The ordinary method of repairing a valve stem o worn is to heat,draw out, or lengthen the! 40 stem to compensate for .the portion worn Aaway. In doing this the stem is often sprung or thrown out of line andspoiled and the valve or the lift, or both, have to be re-` placed withfresh ones.

My improved device completely obviates the above ditticult-y. The bottomportion of the little -caps may be made of any desired thickness andhardened and when. a repair is to be effected al cap of 4the properthickness is selected and quickly applied to the end of the valve stemor to the litter, or both, fully and permanently restoring these partsto their original usefulness.

Another feature ot the 'invention is that should the bottom of the capbe too thin to replace the entire portion worn away I have provlded aplurality of thin disks or washers adapted to be readily droppedinto'the inside o't the cup before it is positioned, to build up thisbottom or contacting portion so as to obtain exactly the requireddistance between the end of the stem and the working 'tace of the cap.

a With these and other objects 1n view, the invention consists ofcertain Ynovel features e5 o'f construction, as will be more fullydescribed and particularly pointed out in the appended claims. i

In the accompanying drawings: Figure lshows a valve and its applicationto its seat which/is shown in section, also showing the valve lift and acontact or wear receiving cap or thimble on both the valve stem and thevalve lifting member. .2 is a l detail in perspective of the cap or cupas made from solid stock. Fig. 3- is a sec- 'tional View of the same.Fig. 4fshows one ot' the caps as slotted to render its walls springvoryieldable so that it may be pressed in position onthe end of the stemand be retained thereon by friction. Fig. 5- is a sectional viw of theconstruction 'illustratedl in Fig. il. Fig. 6- illustrates one ot' thelittle caps as having been drawn up and constructed from esheet metal.Fig. 7- is an 85 enlarged view showing one of the disks or washers whichare inserted into the cap for building up or thickening'the lower endVof ,thehame i Referring to the drawings, l designates the valve casing,a portion of which is shown in section. The valve 9., which is of the.usual beveled seated' type, ndsfits seat at 3 in said casing and itsstem 4f, which is formed integral with thevalve', project-s 95 downwardto meet the valve lift 5, lwhich latter is raised bythe cam 6 to engageand open and close the valve at: the proper time for the operation ofthe engine. l

lThe contacting ends 'of both" the yalve 1,00 i

stem and the stem of the .lifting member are shown as beingsupplied withcaps 7 and 8- respectivly. These caps may be constructed plain and 'fromsolid stock, as illustrated in Figs. 2 and 3, or they may be 1`05 drawnup into a cup shape troni sheetstock of any suitable thickness, ifdesired. see Fig.

G. and hardened so they will tit .tightly onto the ends oit' the valvestems. The cap may ,be slotted as at 9, see Figs. il, 5 and t3, if de-110 sired, and its upper 'edge'bent inward as at l0, see Fio'. (5, so asto grip stem and be retained in' position thereon by a yieldingpressure. If desired, a set screw l1 may be employed for retaining thecap in position, or Vbot-h the set screw and the spring lips may be doneaway with and the caps be formed Ito lit tightly and be forced intooperative position and caused to hold themselves by friction only.

A feature of this invention is that in order to avoid the grinding orfilling of the contacting surfaces of these caps to reduce them to therequired thickness for setting the valve, I have provided a very simple,inex pensive and effective method of accomplishing this purpose bysupplyinga plurality of extremely thin washers l2 which` may be coppedinto the cup, as illustrated in Fig. l, for the purpose of building upor increasing the distance between the end of the stern and the workingface of the cap.

My improved cap or thimble supplies a `long felt-,avant for a simple,inexpensive and effective method of renewing the worn portion of a valvestem and restoring the same to its original length, timing andconsequent effectiveness.

Having thus described my invention, what I claim as new and desire tosecure by lieb ters Patent, is:

l. As a new -article of manufacture, a hardened metallic cap having asubstantially plain bore the sides of which are substantially parallelland adapted to be readily applied to an engine valve stern or valvelifter whereby the worn contacting surlnccsl between the stem and thelifter inay be readily renewed, said cap having means whereby the sameis retained in position solely by friction.

2. As a new article of manufacture, a hardened metallic cap having asubstantially plain bore and adapted to be readily applied to an enginevalve stem or valve lifter whereby the worn contacting surface betweenthe stem and the lifter may be renewed, means in said cap for retainingthe saine in position, and means for regulating wenn applied to anengine l'alve stem or valve lifter whereby the worn contacting surfacebetween the stem and the lifter may be renewed, and spring retaining'walls 1n said cap whereby the saine is retained in its .operativeposition by friction.

4. As a new article of manufacture. a hardened metallic cap having asubs-lantially plain bore and adapted tobe readily applied to an engineValve stem or valve lifter whereby the worn contacting surface betweenthe stein and the lifter may be renewed, said cap being retained inposition by friction, and one or more spacing' washers in said capwhereby the distance vbetween the thrust receivii-ig end of the steinand the working face of said cap may be regulated.

5. As a new article of manufacture, a hardened metallic cap having asubstantially plain bore and adapted to be readily applied to an enginevalve stem or valve lifter whereby the worn contacting surfacedwtweenthe stem and the lifter may be renewed. spring retaining walls in saidcap whereby the same is retained in its operative position by friction,and one or more spacing washers in said cap whereby the distancebet'wccnthe thrust receiving end of the stem and the working face ofsaid cap may be regulated.

f5. The combination with a valve stem and cooperating valve lifter of anengine, of hard metal caps removably fitted to the opposing ends of saidstem and lifter, said caps being renewable to` preserve the proper icooperation of the stem and lifter.

ln testimony whereof I affix my signature 1n presence of two witnesses.

Janus A. iut-HARDY.

llfitnesses:

Howmn ll. BAuLow, E. l. OumcN.

